Rough Sets, Fuzzy Sets, Data Mining and Granular Computing 11th International Conference, RSFDGrC 2007, Toronto, Canada, May 14-16, 2007. Proceedings - An, Aijun; Stefanowski, Jerzy; Ramanna, Sheela; Butz, Cory J.; Pedrycz, Witold; Wang, Guoyin (Springer Berlin Heidelberg : Imprint: Springer, 2007)